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DX56D+ZF Galvannealed Steel Coil
Product Description
DX56D+ZF Galvannealed Steel Coil is a zinc-iron alloy coated steel product designed for extra deep drawing applications and demanding cold forming processes. Manufactured through continuous hot-dip galvanizing followed by controlled alloying heat treatment, DX56D+ZF features a metallurgically bonded zinc-iron coating that supports subsequent painting, resistance spot welding, and metal fabrication.
Also referenced as DC56D+ZF in some material specifications and procurement inquiries, this steel grade combines an extra-deep-drawing-quality substrate with a zinc-iron alloy coating. DX56D+ZF offers high elongation and improved plastic deformation characteristics, making it suitable for components involving complex geometries and demanding forming operations.
DC56D+ZF is a material option for manufacturers producing automotive stamped components, appliance panels, electrical housings, and industrial sheet metal parts requiring high formability and subsequent surface finishing. Compared with DX54D+ZF, DX56D+ZF has higher minimum elongation, plastic strain ratio, and strain hardening exponent requirements in Rosen's published specifications.
Rosen supplies DX56D+ZF Galvannealed Steel Coil with different coating specifications and dimensions, subject to production availability.
Product Features
Material Grade and Applications
Coating Types and Surface Treatment Methods
Available Range
Chemical Composition
Mechanical Property
Product Features
Zinc-Iron Alloy Coating
DX56D+ZF features a ZF coating formed through hot-dip galvanizing followed by controlled alloying heat treatment. Iron diffuses into the zinc layer to form a zinc-iron alloy coating with a characteristic matte gray appearance.
Extra Deep Drawing Performance
DX56D is intended for extra deep drawing applications requiring high deformation capability. Its mechanical properties, including elongation, plastic strain ratio, and strain hardening exponent, support demanding forming operations involving complex component geometries.
High Elongation and Formability
The higher minimum elongation of DX56D+ZF supports greater plastic deformation during forming. Its r-value and n-value are also important indicators when evaluating material suitability for demanding stamping processes.
Good Paintability
The galvannealed surface provides favorable characteristics for subsequent painting and powder coating. Appropriate cleaning and surface pretreatment should be selected according to the final coating system.
Resistance Spot Welding Compatibility
The zinc-iron alloy coating is suitable for resistance spot welding applications. Welding current, electrode pressure, welding time, and electrode maintenance should be adjusted according to the coating specification and production conditions.
Corrosion Protection
The zinc-containing alloy coating provides sacrificial corrosion protection to the steel substrate. Coating mass, surface treatment, and additional painting systems should be considered together to meet the corrosion protection requirements of different applications.
Material Grade and Applications
DX56D+ZF consists of a DX56D steel substrate and a ZF zinc-iron alloy coating. It is intended for extra deep drawing applications requiring higher formability than conventional drawing and deep drawing grades.
Material Specification | Description |
|---|---|
Steel Grade | DX56D+ZF |
Reference Grade | DC56D+ZF |
Applicable Standard | EN 10346 |
Substrate Grade | DX56D |
Coating Type | ZF - Zinc-Iron Alloy Coating |
Forming Category | Extra Deep Drawing |
Product Form | Steel Coil |
Automotive Components: Complex stamped automotive panels, formed body components, and parts requiring demanding deformation and subsequent painting.
Home Appliances: Deep-drawn refrigerator components, washing machine panels, and complex appliance sheet metal parts.
Electrical Equipment: Formed electrical enclosures, metal housings, and cabinet components requiring complex shapes.
Industrial Equipment: Deep-drawn covers, equipment casings, and fabricated metal components involving demanding forming operations.
Metal Fabrication: Complex sheet metal parts requiring extra deep drawing, bending, and subsequent surface finishing.
Coating Types and Surface Treatment Methods
DX56D+ZF uses a zinc-iron alloy coating designated as ZF. Different surface treatments can be selected according to storage, forming, welding, and subsequent finishing requirements.
Surface Treatment | Code | Description |
|---|---|---|
Unprocessed | U | Without additional surface treatment |
Chromic Acid Passivation | C | Passivation treatment for surface protection |
Oiling | O | Oil application to support storage and processing |
Passivation + Oiling | CO | Combined passivation and oiling treatment |
Chrome-Free Passivation | C5 | Passivation without chromium |
Chrome-Free Passivation + Oiling | CO5 | Combined chrome-free passivation and oiling |
Chrome-Free Inorganic Passivation | IC | Inorganic passivation treatment without chromium |
Chrome-Free Inorganic Passivation + Oiling | ICO | Combined inorganic passivation and oiling |
Self-Lubricating | SL | Surface treatment with self-lubricating properties |
Chrome-Free Self-Lubrication | SL2 | Self-lubricating treatment without chromium |
Easy-Workability Self-Lubrication | EW | Surface treatment designed to support forming operations |
Inorganic Self-Lubrication | SW | Inorganic self-lubricating treatment |
Inorganic Solid-State Lubrication | T | Inorganic solid-state lubrication |
Chrome-Free Fingerprint-Resistant | N5 | Surface treatment for fingerprint resistance |
Conductive and Fingerprint-Resistant | NE | Chrome-free conductive and fingerprint-resistant treatment |
Available surface treatments should be confirmed according to actual production specifications and order requirements.
Available Range
Rosen supplies DX56D+ZF Galvannealed Steel Coil within the following published galvannealed steel product range. Specific grade, coating, and dimension combinations are subject to confirmation.
Parameter | Available Range |
|---|---|
Steel Grade | DX56D+ZF |
Thickness | 0.5–2.5 mm |
Width | 800–1800 mm |
Coil Inner Diameter | 508 mm / 610 mm |
Coating Type | Zinc-Iron Alloy Coating (ZF) |
Coating Weight | 80–120 g/m² (Double-Sided) |
Stock Delivery Time | Approximately 10 days |
Custom Production Lead Time | Approximately 60–80 days |
Chemical Composition
The following table presents the chemical composition limits published in Rosen's galvannealed steel specifications. Values are expressed as maximum mass percentages.
Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Ti (%) |
|---|---|---|---|---|---|---|
DX56D+ZF | ≤0.01 | ≤0.30 | ≤0.30 | ≤0.03 | ≤0.02 | ≤0.20 |
Mechanical Property
DX56D+ZF is designed for extra deep drawing applications. Its mechanical properties include higher elongation, plastic strain ratio, and strain hardening exponent requirements compared with the lower forming grades in Rosen's published specifications.
Property | Specification |
|---|---|
Yield Strength | 120–180 MPa |
Tensile Strength | 260–350 MPa |
Elongation (A80) | ≥37% |
Plastic Strain Ratio (r90) | ≥1.7 |
Strain Hardening Exponent (n90) | ≥0.20 |
Actual mechanical properties should be verified against the applicable product standard and the material test certificate supplied with the order.
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